Originally Posted by
ferry pilot
Harmonic vibration coupling in aviation accidents is rare but has happened. If blade bounce could shake the tail boom at the same frequency, is it not possible the combined resonance could do what whirl mode did to the Electra? I am not an engineer, but very familiar with the Electra story.
I follow your point. The FAA have a good summary of the pair of Electra accidents and suspected cause of both:
https://www.faa.gov/lessons_learned/...nd%20propeller
That page has video showing testing on a dynamically scaled Electra model in a wind tunnel and a still of the model with the wing torn off.